Safety cut-off device fob burners



y 1934- F. G. HAUSLER ET AL 1,958,242

SAFETY CUT-OFF DEVICE FOR BURNERS Filed June 6, 1952 2 Shets-Sheet 1 I I m i,

INVENTORgj 9 M ATTORNEYS May 8, 1934. F. G. HAUSLER ET AL 1,958,242

SAFETY CUT-OFF DEVICE FOR BURNERS Filed June 6, 1932 2 Sheets-Sheet 2 52 3- 35 Z3 93 INVENTOR-S MTORNEY Patented May 8, 1934 UNITED STATES PATENT OFFICE SAFETY CUT-OFF DEVICE FOR BURNERS of Ohio Application June 6, 1932, Serial No. 615,548

17 Claims This invention relates to a safety ignition device for use in connection withpilot and service burner combinations, such as are commonly used on gas ranges, and is particularly adapted to efiect admission of fuel automatically to a service burner only after the pilot burner has been ignited and I remained so for a predetermined short interval.

In the copending applications of Fred G. Hausler, Ser. Nos. 580,074, 580,075 and 580,076, all filed December 10, 1931, are-described ignition devices and pilot burners wherein the flow of fuel to the pilot is thermostatically controlled and is decreased automatically consequent upon the pilot remaining ignited for a short interval, a large volume of fuel being supplied initially for better insuring lighting of the pilot. The thermostatically controlled .pilot also increases the fuel passage to the pilot if the pilot flame becomes so low that there is danger of its being extinguished. In these copending applications is also described a cutoff valve which is operated by the thermostatically controlled pilot and automatically blocks the main feed line to the various burners in the event the pilot becomes and remains extinguished for a short interval.

Again, in these applications, is described an ar rangement of firing tubes for maintaining mutual firing relation between the pilot and service burners.

With these devices installed and in operation, the dangers resulting from the escape of unburned gas due to accidental extinguishment of the pilot and service burners are very greatly reduced, and various burners with which the devices are associated are rendered exceedingly safe. There automatic devices, may admit gas to the burners and pilot and then fall to light the pilot in the first instance, or may light the pilot and the samemay be extinguished almost instantaneously and unknown to the operator. Under such circumstances, the devices mentioned may fail to block the supply of fuel to the burners. Consequently, there results a dangerous accumulation of gas which may later become ignited and explode. The present invention contemplates the provision of a valve which is operated by a suitable mechanism responsive to the heat from the pilot, and which normally blocks the flow of fuel to the service burners, the valve operating to admit fuel to the service burners from a source of supply only when the pilot has been ignited and has remained so for a short interval, so that it has become warm and burns efliciently. Consequently, with the present device installed, this danger also is eliminated and passage of fuel to the service burners before the pilot is ignited or burning efficiently, or when it has become extinguished almost instantaneously after being ignited, is prevented.

For the purposes of illustration, an embodiment of the present invention adapted for use in connection with domestic gas ranges and gas bumers is described, other forms of the device and uses with other fuel burners being apparent from such description.

In the drawings, Fig. 1 is a somewhat diagrammatic partial plan view of a gas range with the present invention installed;

Fig. 2 is an enlarged partial sectional plan view illustrating an improved manner of maintaining mutual firing relation'between the service burners and pilot;

Fig. 3 is a vertical sectional view taken on a plane indicated by the line 33 of Fig. 2;

Fig. 4 is a longitudinal vertical sectional view of the cutoif device and pilot;

Fig. 5 is a partial plan view of the device illustrated in Fig. 4;

Fig. 6 is a sectional view of the latching stays showing the stays in latching position;

vFig. '7 is an enlarged plan view of the latching stays illustrated in Fig. 6;

Fig. 8 is a plan view of the latching elements illustrated in Fig. '7, and

Fig. 9 is a sectionalview taken on a plane indicated by the line 99 on Fig. 4. 1

Fig. 10 is a cross sectional view of one of the thermostatic elements of the device;

Fig. 11 is a fragmentary sectional view of the valve taken on a plane indicated by the line 1111 of Fig. 4;

Fig. 12 is a fragmentary sectional view taken on a plane indicated by the line 12-12 of Fig. 4; and

Fig. 13 is a fragmentary sectional view taken on a plane indicated by the line 13-13 of Fig. 4.

Referring to Figs. 1 and 4, the device may include an elongated hollow valve body 1 which is connected near one end to a main gas feed line 2. At the opposite end, the body communicates with a service-feed line 3 which conducts gas from the body 1 to the service burners 4. The usual turn cock connections '5 are provided, one for each service burner, for regulating and stopping the flow of gas thereto. Within the body 1 is a valve seat 10, on which seats the main cutoff valve disc 15, as better illustrated in Figs. 4, 6 and '7. An easily assembled means for supporting the valve disc 15 in proper position relative to the seat 10 may include a sealing cap 12, threaded for engagement with the body 1. Carried on the cap 12 is a bearing 13 adapted to receive and slidably mount a valve post 14 rigidly secured to the valve disc 15. The disc 15 is adapted to seat on the inlet side of the seat 10, sealing the passage therethrough and being movable toward the cap 12 for unseating. A suitable spring 16, embracing the bearing 13, may be used for positively forcing the valve disc 15 against the seat so that the valve may operate in any position and 'is not dependent on its own weight to effect the seating action thereof. At the opposite side of and spaced longitudinally of the body from the valve seat 10 is a bridge 17 having a passage therethrough adapted to receive a valve post 18 which fits snugly into a bore in the valve 15 and post 14. The post 18 is coaxial with the post 14 and valve disc and extends in the opposite direction from the post 14. Pivotally mounted on the end of the post 18 is a stay latch, later to be described, for controlling the operation of the valve. As will be more fully described, when the valve is moved to 1mseated position and there latched, the gas may flow through past thevalve into that part of the body from which it may pass to the pilot and service burners, but when the valve 15 is seated, the flow of gas to both the pilot and service burners is stopped.

The other end of the body 1 is internally threaded to receive the service feed conduit 3 which communicates the interior of the valve body with the service burners, as described. Within the body 1 near this end is a valve seat 19, on which an auxiliary valve disc is adapted to seat for opening and closing passage therethrough, thereby communicating and discommunicating the valve body and service feed conduit 3. A disc valve similar to the valve 15 may be used for this purpose. This valve comprises a disc 20 disposed on the side of the seat 19 away from the outlet opening to the service conduit 3 and is movable in the same direction as the valve disc 15 for seating and unseating. The valve disc 20 may be rigidly mounted on a post 21 slidable in a bearing 22 which in turn is supported on a spider or bridge 23 rigidly secured within the body 1. In order to insure positive unseating operation of the disc, a coil spring 24, embracing the bearing 22 and abutting the disc 20, is provided. On the opposite side of the disc 20 from the spring 24 is a detachable bridge 26 in which is slidably mounted a sleeve 27. A valve post 28 rigidly secured to the disc 20 at one end extends inwardly of the valve and is slidably received in the sleeve 27 so as to permit relative axial movement of the sleeve and post 28.

On the end of the sleeve 27, adjacent to the valve disc 20, is formed or mounted a boss 29, having a marginal shoulder. A coil spring 30 fits snugly onto the boss 29 at oneend, the other end of the spring abutting the valve disc 20, so as to normally urge the sleeve and disc relatively away from each other. The spring 30 is preferably heavier than the spring 24, for example, the spring 30 may be of six pound pressure while the spring 24 is of four pound pressure. It is apparent that if the sleeve 27 is forced to the right toward the valve disc, the spring 30 is thereby compressed and since it is of greater strength than the spring 24, the force exerted through the medium of the spring .30 moves the valve disc 20 to the right, compressing the spring 24 sufliciently to permit seating of rthe disc 20 on the seat 19. On the other hand,

when pressure on the sleeve 27 is relieved so as to' relieve compression of the spring 30, the valve disc, spring 30 and sleeve are forced bodily to the left by the spring 24, thus unseating the valve disc.

In order that the valve discs 15 and 20 may be latched in the desired operating positions, latch stays 31 and 32 are pivotally connected to the adjacent ends of the post 18 and the sleeve 27 respectively. Rigidly mounted within the body 1 is a complementary latching element which may comprise a latching yoke 33 which protrudes radially inwardly of the body past the common axis of the valve discs. It should be noted that the post 18 and the sleeve 27 are coaxial. The arms 34 and 35 of the latching yoke 33 are positioned for engagement with shoulders on the latch stays 31 and 32 respectively.

Referring to Fig. 6, each of the latch stays 31 and 32 may comprise elongated metal strips, bifurcated longitudinally to form arms 36 and 36a respectively at one end. Yoke arms 37 are provided on the opposite ends, the yoke arms being tapped to receive pins for pivotally securing the stays to the members with which associated. On the stays 31 and 32 are shoulders 38 and 39, respectively, which are adapted to bear against the respective arms 34 and 35 of the latch yoke 33.

It is apparent that by exerting force on the stay 31 to force the valve disc 15 away from the seat and then lowering the stay so that the shoulder 38 passes into abutting relationship with the arm 34 of the latch yoke 33, as illustrated in Fig. 6, that the compression of the spring 16 will hold the shoulder 38 tightly thereagainst, and since the direction of pressure is substantially through the center of the shoulder and pivotal connection of the stay with the arm 18 and through substantially the center of the arm 34, the stay will be maintained in this latching position by the spring 16, the stay in turn maintaining the spring in the compressed condition. If the stay 32 is forced to the right until the shoulder 39 has passed slightly beyond the shoulder 35 of the latch yoke 33 and is then lowered, the shoulder 39 is disposed in position to abut the shoulder 35. This movement of the stay 32 to the right to this position forces the sleeve 27 and boss 29 in the same direction against the spring 30 and compresses the spring. Since the valve post 28 is slidable axially in the sleeve 27, the sleeve and boss may move relatively closer to the disk 20 for permitting such compression of the spring 30 between the boss 29 and the disk 20. When the boss 29 has been moved to the right by the stay 32 sufiiciently far to dispose the shoulder 39 of the stay slightly to the right of the shoulder 35 the spring 30 thereby has been compressed to more than a sufficient degree to overcome the spring 24. Consequently, during compression of the spring 30 the disk 20 has been forced to the right by the spring 30 against the resistance of the spring 24thus forcing the disk 20 into seating or closed position. In this position the spring 30 reacts against'the boss 29 and urges the boss' 29 and sleeve 27, and consequently the stay 32 toward the left whereupon the shoulder 39 of the stay is placed in stressed abutting relation to the shoulder 35 of the latch yoke and holds the spring 30 compressed sufliciently to maintain the disk 20 seated. In this position, which is the operating position of the stove for lighting, the main feed vave 15 is open and the valve 20 is seated, thus permitting flow of fuel into the valve body and blocking the flow of fuel from the body to the service burners through the service feed line 3.

In order to seat the stays in this locking position illustrated in Fig. 6, a manually settable means is provided. This means comprises a shaft 40 extending from the outside into the body 1 and having its inner end rotatably mounted in the end of the yoke 33. The shaft 40 is rotated through the proper angle by means of a rod 41 which extends to a convenient place on the stove and is pivotally connected to a suitable lever on the rod 40. The usual spring return is provided on the rod 41 to return it and the shaft 40 to idle position. Rigidly secured on the shaft 40 intermediate the arms and 34 of the latch yoke 33 is a setting or cocking element adapted to engage the stays 31 and 32 when the shaft is rotated by the operator and to move the stays into latching position. This element may oomprise oppositely projecting arm: 42 and 43 adapted to pass between the arms 36 and-36a of the respective stays 31 and 32 which, as stated, are bifurcated at their adjacent ends. Suitable pins 44 extending transversely of the stays 31 and 32 are secured in the ends of the arms 42 and 43, these pins overhanging the stays 31 and 32 so as to prevent relative passage of the stays beyond the ends of the arms 42 and 43 respectively.

It should be notedthat the arms 42 and 43- are each rounded out, as indicated at 46 and 47 on the operating faces, these concave camming surfaces being adapted to engage the end walls of the bifurcations between the arms 36 and 36a respectively. When the shaft 40 is rotated from right to left in the structure illustrated in Fig. 4, the concave camming surfaces of the arms 42 and 43 respectively engage the end walls of the bifurcations of the stays 31 and 32, thus forcing the stays in opposite directions. This forces the stays 31 and 32 toward their respective valves a distance sufficient so that shoulders 38 and 39 thereof are moved in position to engage the outer faces of the arms 34 and 35 of the yoke 33. Due to the curve of the camrning surfaces of the arms 42 and 43, when the stays are moved to this position, they are forced downwardly so as to dispose the respective shoulders 38 and 39 back of the yoke arms 34 and 35, thus locking the valve 15 in unseated position. and the valve 20 in seated position. In this condition, the pilot which is more fully described in the above mentioned copending applications is lighted. The pilot, as described in said copending applications, comprises a plug 50 slidably mounted in a sleeve 51 which may be integral with the body 1 of the valve. Toward the bottom of the sleeve 51 is a seat 52 which is adapted to engage a complemetary seat 53 on the plug 50 when the plug is moved inwardly of the sleeve. The lower end of the sleeve 51 is provided with a smaller coaxial bore 54 adapted to receive a complementary neck 55 on the plug-50. The fit'between the neck 55 and bore 54 is loose enough to permit the flow of gas therebetween. Extending through the plug 50 and neck 55 is a duct 56 which communicates with the interior of the valve body and discharges at the top of the pilot plug 50. Auxiliary ducts 57 are provided in the head of the plug 50, these ducts cormnunicating with the duct 56 internally of the plug and extending downwardly and opening onto the seating surface 53 of the plug. Thus when the plug is unseated, these auxiliary ducts conduct the gas passing between the neck 55 and its complementary bore 54 into the duct 56 internally of the plug. A regulating screw 58 of the usual type is threaded into engagement with the plug 50 from one side and protrudes into the .70 and passes-the shoulder.

duct 56 below the junction of the ducts 57 therewith. The screw 58 may be screwed inwardly and outwardly of the plug to regulate the normal flow of gas from the portion of the duct 56 below the screw 58 into the portion of the duct 56 above the screw 58. The portion of the duct 56 above the screw 58 is of ample size to accommodate the flow of gas from the lower portion of the duct past the screw 58 and in addition the gas from the ducts 57. Secured to the plug 50 are upwardly and oppositely extending yoke arms 60 to which are pivotally secured the upper ends of bimetallic thermostatic elements 61. Thelower .ends of these elements are secured to an annular base 62 adapted to pass over the outside of the sleeve 51. Suitable projections 63, which may be detachable, are secured to the body 1 and are adapted to receive spring arms 63a on the annular base 62 when the annulus is seated about the sleeve and turned into position. The projections 63 are slightly recessed so as to receive the ends of the spring arms, thus fastening the annulus 62 firmly in place. The thermostatic members 61 are similar in all respects to those described in the above identified copending applications and are adapted to force the plug downwardly when heated, thus obstructing the ducts 57 and decreasing the supply of gas to the pilot and to raise the plug when cooled slightly to increase the flow so as to maintain a safe pilot flame. The elements raise the plug still farther when cooled due to extinguishment of the pilot, and in this last position, initiate operation of the main cutoff valve. Thelower end of the neck 55 is provided with a nib 64 adapted to receive a coaxial coil spring 65. Mounted in the lower end of the coil spring by squeeze-fitting thereinto, is a trigger 66 which is adapted to trip the latch stays 32 and 31 as the plug is lowered and raised respectively. The trigger 66, at its' lower end, is provided with an operating head 67 which is roughly in the form of an inverted cone, the lower tip being pointed slightly, as indicated at 69, so as to pass between the arms of the stay 32 when the trigger is forced downwardly thereagainst. The stay 31 near the pivot end is cut out to form a passage for the head 67 therethrough and to form a shoulder 70 which extend: partially into the path of movement of the head 67. As the head 67 is moved downwardly by the pilot, due to heating of the thermostatic elements, the lower surface of the head strikes the shoulder 70 and, due to the resiliency of the spring 65, the head is shifted to the left a slight amount by the shoulder After this relative passage, the spring returns the head to its normal position so that the upper surface 72 thereof is positioned under the shoulder 70 of the arm 31.

the duct 56 in the pilot 50, the valve 20 being held seated by the stay 32. If the pilot is then lighted and 'remains burning sufficiently long to heat the thermostatic elements 61, the plug 50 lowers, thus forcing the trigger head 67 downwardly past the stay 31 until the lower end thereof engages 1' .1-

the stay 32. v This action continues until the plug has moved sufliciently low so that the lower end of the head 67 has engaged the arms 38 of the stay 32 and forced them downwardly sufficiently far so that the shoulder 39 is moved below the L.

yoke arm 35, thus unlatching the stay. The pointed end portion of the head 67 passes between the arms 36a and guides the head into proper position as it is lowered. This action relieves the pressure on the spring 30 and the spring 24 thereupon unseats the disc 20 forcing the sleeve 27 and stay 32 and spring 30 to the left. In this manner, the fuel is passed to the service burner only after the pilot has been ignited and remains so for a predetermined interval. If the pilot is subsequently extinguished, the thermostatic elements 61 cool a sufficient degree to lift the pilot plug. The shoulder 72 of the head 6'7, having passed beneath the shoulder 70 of the stay 31, engages this stay shoulder upon the upward movement and lifts the stay sufficiently to disengage the shoulder 38 from the latch yoke arm 34. This action unlatches the. valve 15 which is thereupon seated by the spring 16 so that the flow of fuel to both the pilot burner and service burners is entirely blocked. Consequently, all burners are rendered inoperable until the operator has again rotated the shaft 40 sufficiently to cam the stays 31 and 32 into latching position.

In order to maintain mutual lighting relationship between the pilot and service burners, the pilot is enclosed in a shell which is adapted to engage the outer surface of the projections 63 and fit snugly thereover. On the upper end of the shell 80 is a head portion. 81 which is provided with radial bores 82 of substantially the same diameter as the firing tubes 83 which lead to the burners.

The tubes 83 are preferably somewhat loosely fitted into the bores 82 to permit positioning them in proper relation to the burners with which associated. A central bore 84 coaxial with the shell 80 and with the pilot therein extends through the head 81 and opens upwardly. The inner ends of the bores 82 communicate with the bore 84, these inner ends being oval shaped, slightly higher and somewhat narrower than the firing tubes or the outer ends of the bores 82 so that the firing entrances of all of the bores may be brought closely together and close to the pilot flame. In order to protect the pilot flame from materials that may fall thereinto from the stove, a weight supporting cap 85 having a spider adapted to fit snugly into the bore 84, is provided, this cap being in spaced relation to the top wall of the head 81 by means of the spider arms 86, so as to form between the cap 85 and head 81, a passage for heated air rising from the pilot. The cap 85 also protects from the direct heat of the pilot, the usual enameled top plates which are used on ranges.

An air vent 87 is formed in the shell 80 in a position to permit insertion of a match for lighting. the pilot burner and also to supply cool air to the interior of the shell. Additional air vents 89 are provided in the head 81 and extend downwardly between the walls of adjacent passages 82, thus maintaining the thermostatic elements in cooler circulating air and consequently, rendering them more promptly responsive to variations in intensity of the pilot flame.

The firing tubes which are better illustrated in Fig.1 are secured in the passages 82 as described and terminate in spaced relation to the ends of the respective service burner arms. The end walls of these burner arms are tapped so as to permit the flow of gas therefrom directly into the firing tubes. The firing tubes are preferably flared adjacent to the arms of the burner as indicated in Fig. 3 so as to provide a Venturi effect for supplying additional air for combustion of the gas in the firing tubes and so as to fire over the vents in the service burner for lighting the same. Obviously if any service burner becomes extinguished, the firing tube leading thereto will become filled with gas, which in turn will be ignited by the pilot and flash back, lighting the burner; likewise, if the pilot is extinguished, it usually will be relighted almost instantaneously if any one of the service burners is operating. In order to maintain the ends of the firing tubes in proper position to receive gas from and fire onto the service burners, yoke arms or projections 88 may be provided on the outer ends of the tubes, these arms being adapted to engage the side walls of the service burner and thus hold the tube in proper position in case the burner is shifted for any reason.

From the above description, it is apparent that devices embodying the principles herein disclosed will eliminate substantially every conceivable danger arising from failure to ignite properly either the service burners or the pilot burners of a service and pilot burner combination, thus clearly increasing the ,degree of safety and effectiveness thereof.

The above invention, when constructed in proportions described and illustrated in Fig. 4, will operate within about twelve to fourteen seconds of time and will remain latched in the positions required under severe jars or vibration.

However, to guard against any possibility of the valve disc 20 being jarred loose and unseated accidentally while the valve disc 15 is open and before the pilot has been lighted, a safety idler, adapted to unlatch the valve 15 for seating consequent upon such accidental unlatching and unseating of the valve 20, is provided.

Referring to Figs. 7 and 9, the idler comprises a body 90, loosely mounted on the outer end of the shaft 40 so as to swing freely thereabout. The idler has spaced arms 91, adapted to lie between the arms of the latch stays 31 and 32, so as to rise against the underside of the stay 31 when the idler is rotated from left to right about the shaft 40. A projecting arm or lug 92 of the idler extends below the head of the yoke 33 sufficiently far to be engaged by a pin 93, rigidly secured in the stay 32, when the stay is unlatched and moves to the left. The movement of the stay and pin 93 to the left swings the idler about its pivot, the arms 91 lifting the stay 31 and unlatching it from the arms of the yoke 33, thus cutting off completely the flow of gas to all burners. When, however, the pilot operates to release the stay 32, the idler must be rendered ineflective. This is accomplished by a pin 94 secured in the head 6'? of the trigger and extending transversely of and overhanging the arms 91 of the,idler. As the head 67 is moved downwardly by the pilot, the pin 94 engages the arms 91, swinging the idler in the opposite direction and thus disposing the lug 92 above the path of travel of the pin 93 before the head has moved sufficiently far to trip the stay 32. Consequently,

the idler is not operated when the pilot operates the stay 32. In order to maintain the idler in proper position, that is, with the idler lug 92 in position for engagement by the pin 93, a counterweight 95 may be formed thereon. In this man- L ner additional safety is effected.

It is apparent from the foregoing description that devices embodying the principles of this invention preclude operation of the range in a bination, a valve, said valve communicating and discommunicating the service burner with a source of fuel when the valve is open and closed respectively, a manually settable latching means for closing said valve and latching the valve in closed position, thermostatic means responsive to the heat of the pilot burner for tripping the latching means for unlatching said valve conscquent upon continued heating of the thermostatic means by the pilot for a predetermined interval, and means for opening said valve when unlatched, whereby the pilot must be ignited and burned for a predetermined period before fuel can pass to the service burner. l

2. In a pilot burner and service burner conibination, a conduit for supplying fuel to the service burner, a valve in said conduit for blocking and unblocking the flow of fuel therethrough, a manually movable means for closing said valve and latching the valve in closed position, said valve blocking the flow of fuel through said conupon continued operation of the pilot for a predetermined interval for unlatching said valve, and a spring for opening said valve when said valve is unlatched.

3. In a pilot and service burner combination, a conduit for passing fuel to the service burner, a valve body connected with said conduit, a valve plug operable in said body, a seating spring urging the plug. into closed position when theseating spring is compressed, an unseating spring urging the plug into open position against the force of the seating spring when the seating spring is relieved, manually operable means to compress the seating spring and the unseating spring and to latch the same in compressed condition whereby the seating springmaintains the valve closed, and means operable consequent upon continued operation of the pilot for a predetermined interval to unlatch the seating spring whereby the compression is relieved and the unseating spring moves the plug into open position and communicates the service burner with a source of fuel.

4. In a pilot burner and service burner combination, a main valve, an auxiliary valve, said main valve blocking and unblocking passage of fuel to both of said burners when closed and open. respectively, said auxiliary valve blocking and unblocking passage of fuel to the service burner when closed and open respectively, means to set and latch the main valve in open position and the auxiliary valve in closed position, thermostatically actuated means in heating relation to the pilot and operable consequent upon heating thereby for unlatching the auxiliary valve when heated by the pilot to a predetermined degree, means for opening the auxiliary valve when unlatched whereby the auxiliary valve opens and:

unblocks the passage of fuel to the service burner, said thermostatically actuated means being operable to unlatch the main valve when cooled a predetermined degree consequent upon extinguishment of the pilot, and means for closing the main valve when unlatched for blocking the flow of fuel to both of said burners.

5. In a pilot burner and service burner com bination, a movable plug in the pilot operable to vary the flow of fuel thereto when moved to predetermined positions, thermostatic means responsive to the heat from the pilot operable to move said plug to vary the flow of fuel thereto, a main valve operable for blocking and unblocking flow of fuel to the pilot burner and service burner consequent upon closing and opening of said main valve, an auxiliary valve for blocking and unblocking the flow of fuel to the service burner consequent upon closing and opening of said auxiliary valve, means operable by said plug when moved a predetermied distance in one direction to initiate unseating operation of the auxiliary valve for unblocking the flow of fuel to the service burner, means to open said auxiliary valve, means operable by the plug when moved a predetermined distance in the opposite direction to initiate seating operation of the main valve for blocking the flow of fuel to both of said burners and means for closing the main valve.

6. In a fluid control device, a cutoff valve plug and seat therefor, a seating spring arranged on one side of said valve plug and urging said valve plug toward and against its seat, an unseating spring urging the valve plug away from its seat, manually settable means to compress the seating spring to a degree sumcient to overcome the unseating spring and to latch the seating spring in compressed condition whereby the valve is closed and the unseating spring is compressed, and thermostatically operable means for unlatching the seating spring whereby the compression of the seating spring is relieved and said unseating spring opens the valve.

'7, In a service and pilot burner combination, a main valve plug for blocking and unblocking the flow of fuel to the burners, an auxiliary valve plug for blocking and unblocking the flow of fuel to the service burner, latch stays carried by each valve plug, latching means engageable with said latch stays, a manually settable element for effecting cooperation of the stays and latching means or maintaining the main valve plug open and the auxiliary valve plug closed, a thermostatic element responsive to the heat of the pilot, means movable by the thermostatic element for unlatching the auxiliary valve when the thermostatic element is heated by. the pilot a predetermined degree, means for opening said auxiliary valve consequent upon said unlatching operation, whereby the service burner is communicated with a source of fuel, means movable by the thermostatic means consequent upon the pilot remaining extinguished for a predetermined interval for unlatching the main valve, and means for opening said main valve consequent upon said unlatching operation, whereby the flow of fuel to both of said burners is blocked.

8. In a service burner and pilot burner combination, means communicating said burners with a source of fuel, a main valve for blocking and unblocking the flow of said fuel to said burners, an auxiliary valve for blocking and unblocking the flow of fuel to the service burners,

communicated with a source of fuel, means operable consequent upon extinguishment of the pilot for unlatching the main valve, means to return the main valve to closed position when unlatched, whereby the flow of fuel to both burners is blocked, and means including a safety idler to engage and trip the latching element of the main valve consequent upon unlatching of the latching element of the auxiliary valve before unlatching thereof by the pilot actuated means.

9. In a service burner and a pilot burner combination, thermostatically actuated means responsive to the heat from the pilot burner and operable to vary the flow of fuel thereto in an inverse relation to the intensity of the heat thereof, means operable by the thermostatically actuated means consequent upon heating of the thermostatically actuated means to a predetermined degree by the pilot burner to admit fuel to the service burner, and means operable by the thermostatically actuated means consequent upon cooling of the thermostatically actuated means to a predetermined lower degree to block the passage of fuel to both the service burner and the pilot burner.

10. In a service burner and a pilot burner combination, a pilot burner, thermostatically actuated means responsive to heat from the pilot flame and operable thereby to vary the flow of fuel to the pilot flame in inverse relation to the intensity of heat from said flame, closure means operable consequent upon predetermined operation of the flrst mentioned means when the first mentioned means is operating to decerase the flow of fuel to the pilot flame to communicatethe service burner with a source of fuel, and means operable consequent upon predetermined operation of the first mentioned means when operating to increase the flow of fuel to the pilot to block the flow of fuel to both of said burners.

11. A pilot and service burner combination including a main valve for communicating and discommunicating the burners and a source of fuel, an auxiliary valve for communicating and discommunicating said service burner with a source of fuel, latch elements carried by each valve, complementary latch means, manually operable means cooperable with the latch elements for effecting engagement of the latch elements and complementary latch means for holding the main valve open and the auxiliary valve cloud, thermostatic means responsive to the heat from the pilot, a member movable thereby, said element being moved by the thermostatic means 1 st the main valve latch element and into engagement with the auxiliary valve latch element for tripping said auxiliary valve latch element when the thermostatic meons is heated to a predetermined degree, means to open said auxiliary valve consequent upon said release, said member engaging the main valve latch element and tripping the same consequent upon the member returning a predetermined distance in the opposite direction, said member being returned by said thermostatic means consequent upon extinguishment of said pilot, and means to close said main valve consequent upon release of sai main valve latching element.

12. In a service burner and pilot burner combination, means communicating said burners with a source of fuel, a main valve for blqcking and unblocking the flow of said fuel to said burners, an auxiliary valve for blocking and unblocking the flow of fuel to theservice burner, latching elements carried by said valves respectively, manually settabie means for moving said latching elements into latching position wherein the main valve is latched in open position and the auxiliary valve is latched in closed position, thermostatic means responsive to heat of the pilot, trigger means operable by said thermostatic means consequent upon continued operation of the pilot for a predetermined interval for unlatching the auxiliary valve, means to return the auxiliary valve to the open position when unlatched whereby the service burner is communicated with a source of fuel, means operable consequent upon extinguishment of the pilot for unlatching the main valve, means to return the main valve to closed position when unlatched, whereby the flow of fuel to both burners is blocked, a safety idler engaging and tripping the latching element of the main valve consequent upon unlatching of the latching element of the auxiliary valve before unlatching thereof by the pilot, and means to render the idler inoperative when the trigger means moves for unlatching the latching element of the auxiliary valve.

13. A pilot burner and cut-off device comprising a hollow body having a discharge passage and adapted for communication with a source of fuel, closure means within said body for controlling the passage of fuel thereinto, means for opening said closure means and latching the closure means in open position, means to return the closure means to closed position when unlatched, a base member, means for detachably mounting said base member on the exterior of the body, thermostatic means connected to the base member, a plug operably connected to said thermostatic means and movable thereby, means on said plug extending through said discharge-passage when the base member is mounted on said body and operable consequent upon movement of the plug by the thermostatic means for tripping said latch means, and disengageable from said latch means when the closure means is closed, whereby the base member and plug and thermostatic means may be removed as a unitary structure for cleaning. I

14. In a service burner and a pilot burner combination, a hollow body adapted to be communicated with a source of fueland having a discharge passage for emitting fuel to support a pilot flame, closure means interiorly of the body for controlling the passage of fuel to the service burner, thermostatic means exteriorly of the body in heating relation to the pilot flame, means extending through said discharge passage and operatively connecting the thermostatic means and closure means and operable to open the closure means when the thermostatic means is heated to a predetermined degree, and means operable by the thermostatic means to block the flow of fuel to both burners consequent upon cooling of the thermostatic means to a predetermined degree.

15. In a service burner and a pilot burner combination, a hollow body adapted to be communicated with a source of fuel, a pilot burner head mounted on said body for movement relative thereto and communicating the interior of the body with the atmosphere for passing fuel therefrom to su port a pilot flame, means cooperable with said head when the head is moved to different positions to vary the flow of fuel to said flame, thermostatic means exteriorly of the body in heating relation to said flame operatively connected to said head and operable to move the head to said different positions in response to heat of said flame, closure means in said body operable when open to pass fuel to the service burner, means operably connecting said head and inseam closure means to open the closure means consequent'upon movement of said head in the direc= tion to reduce the flow of fuel to the pilot flame.

16. In a fluid control device, a hollow body, a main valve and an auxiliary valve therein, said main valve blocking and unblocking an inlet passage into the body when closed and open respectively, said auxiliary valve blocking and unblocking an outlet passage of the body when closed and open respectively, means to latch the main valve in open position and the auxiliary valve in closed position, thermostatically actuated means operable for unlatching the auxiliary valve when said thermostatically actuated means reacts to a predetermined temperature, and operable when said thermostatically actuated means reacts to a difierent predetermined temperature to unlatch the main valve, means for opening the auxiliary valve when unlatched, and means for closing the main valve'when unlatched.

1'7. A fluid control device comprising a hollow body having discharge passages, a movable plug therein operable for varying the discharge of fluid through one of said passages, thermostatic means responsive to heat of combustion of the discharged fluid for, effecting movement of said plug to diiierent positions, a main valve operable to control the flow of fluid into said body, an auxiliary valve for controlling the flow of fluid through the other of said discharge passages, means operable by said plug when moved to one position by said thermostatic means to initiate the opening operation of the auxiliary valve, means to open said auxiliary valve, means operable by the plug when moved to another position to initiate closing of the main valve, and means to close said main valve.

FRED GEO. HAUSLER. GEORGE HEBBSTER. 

